Copper Beryllium Alloy (UNS C81400)

Jul 24 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication
Applications

Introduction

Copper beryllium alloys play an important part in today’s demanding electronics applications. They enable miniaturization of components and products, improve reliability, and increase electrical and thermal conductivity.

UNS C81400 is a beryllium copper casting alloy. Casting methods such as sand, centrifugal, continuous, permanent mold, investment, and plaster are recommended for this alloy.

The following datasheet discusses the chemical composition and properties of copper UNS C81400.

Chemical Composition

The chemical composition of copper UNS C81400 is given in the following table.

Element Content (%)
Copper, Cu ≥ 98.5
Chromium, Cr 0.80
Beryllium, Be 0.020 - 0.10
Other 0.60 - 1

Physical Properties

The following table discusses the physical properties of copper UNS C81400.

Properties Metric Imperial
Density 8.81 g/cm3 0.318 lb/in3
Melting point 1065 - 1095 °C 1949 - 2003 °F

Mechanical Properties

The mechanical properties of copper UNS C81400 are tabulated below.

Properties Metric Imperial
Tensile strength 205MPa 29700 psi
Yield strength 83 MPa 12000 ksi
Modulus of elasticity 110 GPa 16000 ksi
Poisson’s ratio 0.34 0.34
Elongation at break 11% 11%
Hardness, Rockwell B 62 62
Machinability 30 30

Thermal Properties

The thermal properties of copper UNS C81400 are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (at 20-300°C/68-572°F) 19 µm/m°C 10.6 µin/in°F
Thermal conductivity (at 20°C/68°F) 259 W/mK 1800 BTU in/hr.ft2.°F

Fabrication

Welding - Soldering is considered the best welding method for copper UNS C81400, and the brazing is rated as good. Coated metal arc welding and gas shielded arc welding techniques are rated as fair. However, oxyacetylene welding should be avoided.

Applications

Copper UNS C81400 finds application in:

  • Higher hardness electrical and thermal conductors
  • Electrical parts.

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